• The primary endpoint is the change in CPT measurement after placement of SNM therapy as compared to baseline CPT measurements. [ Time Frame: visit 1 ] [ Designated as safety issue: No ]
  

Procedure: Current Perception Threshold (CPT) Testing
During the CPT testing a catheter will be placed in the bladder. The catheter has sensors to record the body's sensation of pressure. The sensation felt will be similar to a light touch and is painless. A gel pad will be placed in the general area of the vagina to record the feeling of a light touch.

Patients will be scheduled 1-2 weeks prior to planned implantation of the SNM wire electrode (Stage 1). Patients that do not have a 50% improvement in their symptoms in Stage 1 will not go on to Stage II procedures and will not undergo further CPT testing.

After enrollment, the subjects will complete a short medical history questionnaire confirming that they meet inclusion criteria and do not fall under exclusion criteria. This will include review of recent urinalysis and/or urine culture confirming the absence of a recent urinary tract infection.

Participants will be given information on the relevant CPT testing including the need for bladder/urethra catheterization as part of that testing pre and post SNM therapy.

At the baseline testing visit, subjects will undergo CPT testing using transcutaneous stimulation in the distribution of the pudendal nerve on the perineum. Subjects will undergo bladder/urethral catheterization in using standard sterile technique. Once the bladder/urethral catheter is in place CPT testing will be conducted at various frequencies of to identify the current perception thresholds of each nerve fiber.

At the conclusion of the testing the catheter will be removed and the subjects will be given a single dose of an oral antibiotic to minimize infection.

This meeting and testing will require approximately 60 minutes.

Patients will undergo Stage I of the SNM procedure with their own physician at a subsequent appointment.

If subjects have a 50% improvement in their symptoms after 2 weeks with Stage 1 SNM, they will under go Stage II of the SNM procedure.

The subjects will have an appointment scheduled for their follow-up CPT testing at the clinical research office 4 to 6 weeks after the Stage II procedure. The subject will be given a urinalysis and urine culture lab slip, and will be instructed to drop a urine sample off at the lab 3 days before their scheduled appointment for testing. If their urine culture is positive, they will be given a prescription for an antibiotic and excluded from this testing. They may however be tested once their urine culture is negative, as long as it is within 2 weeks of their original post-stage 2 CPT test appointment

Subjects will undergo repeat CPT testing using transcutaneous stimulation in the distribution of the pudendal nerve on the perineum. Subjects will then undergo bladder/urethral catheterization using standard sterile technique. Once the bladder/urethral catheter is in place CPT testing will then be conducted at various frequencies to identify the current perception thresholds of each nerve fiber.

At the conclusion of the testing the catheter will be removed and the patients will be given a single dose of an oral antibiotic to minimize infection.

This evaluation will require approximately 60 minutes.